#include <stdio.h>
#include <set>

using namespace std;
int ord[200001],n,op,x,i,nr;
set<int> heap;

int main()
{
	freopen("heapuri.in","r",stdin);
	freopen("heapuri.out","w",stdout);
	
	scanf("%d",&n);

	nr=0;
	for (i=0;i<n;i++)
	{
		scanf("%d",&op);
		if (op!=3) scanf("%d",&x);
		
		if (op==1)
		{
				ord[++nr]=x;
				heap.insert(x);
		}
		else if (op==2) heap.erase(ord[x]);
		else if (op==3) printf("%d\n",*heap.begin());
	}
}